Under Delaware's RPS, rural electric cooperatives and municipal utilities can opt out of the mandated portfolio requirements if they establish a green energy fund and a voluntary green power purchasing program.

The Delaware Municipal Electric Corporation (DEMEC), a joint action agency and wholesale electric company representing the state's nine municipal utilities, opted out of the RPS requirements on behalf of the municipal utilities and began offering a voluntary green power program to its customers starting on June 1, 2006. DEMEC currently offers green power subscriptions in 100 kilowatt-hour blocks at a monthly premium price of $0.21 per block. Customer contracts last for one year (June 1 - May 31). The amount of green energy blocks is limited and subscriptions are awarded on a first-come first-serve basis. The quantity that can be purchased is limited to a customer’s lowest monthly consumption in the preceding twelve months

To enroll in the program, customers should contact the appropriate DEMEC member utility directly.

DEMEC municipal utility members include: Newark, New Castle, Middletown, Dover, Smyrna, Seaford, Lewes, Clayton and Milford. These utilities serve a combined population of 100,000 and have a combined peak load of 435 megawatts.